高速运动声呐海底宽带混响建模与仿真

杨佳宜; 杨云川; 李永胜; 石磊; 杨向锋

doi:10.11993/j.issn.2096-3920.2022-0003

高速运动声呐海底宽带混响建模与仿真

doi: 10.11993/j.issn.2096-3920.2022-0003

中国船舶集团有限公司第705研究所, 陕西西安, 710077

详细信息

作者简介:
杨佳宜(1999-), 女, 在读硕士, 主要研究方向为声自导信号处理技术

中图分类号: TJ630.34
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- 文章访问数: 457
- HTML全文浏览量: 89
- PDF下载量: 72
- 被引次数: 0
出版历程
- 收稿日期: 2022-06-17
- 修回日期: 2022-07-25
- 录用日期: 2022-08-09

Subsea Broadband Reverberation Modeling and Simulation of High-speed Motion Sonar

The 705 Research Institute, China State Shipbuilding Corporation Limited, Xi’an 710077, China

摘要

摘要: 海底混响是鱼雷在声速近似满足负梯度分布的浅海水域进行目标探测时的主要干扰源。为了准确、便捷、可复现地获得混响信号, 并研究其统计特性, 文中提出一种基于Bellhop模型的高速运动声呐海底宽带混响仿真方法。该方法先将对混响有贡献的海底区域划分为若干个不均匀的散射单元, 计算每个单元的散射特征函数, 其中传播损失通过Bellhop模型计算; 再基于网络模型仿真得到包含幅值、相位与多普勒频移等主要影响因子的海底混响模拟信号。最后, 对仿真信号与实航信号进行时频域分析及相似性比较。结果表明, 以仿真信号与实测数据瞬时值的概率密度分布的点积比为评价标准, 文中的方法与实航数据相似度明显提高, 验证了模型的有效性。
- 鱼雷 /
- 海底混响 /
- 运动平台 /
- Bellhop模型 /
- 单元散射模型
Abstract: Subsea reverberation is the main source of interference when torpedoes detect targets in shallow waters where the sound velocity approximately satisfies the negative gradient distribution. In order to obtain the reverberation signal accurately, conveniently and reproducibly, and study its statistical characteristics, this paper proposes a high-speed motion sonar subsea broadband reverberation simulation method based on the Bellhop model. In this method, the seabed area that contributes to the reverberation is divided into several non-uniform scattering units, and the scattering characteristic function of each unit is calculated. The propagation loss is calculated by the Bellhop model. Subsea reverberation analog signal with main influencing factors such as doppler shift. Finally, the time-frequency domain analysis and similarity comparison between the simulated signal and the actual flight signal are carried out. The results show that using the dot product ratio of the probability density distribution of the instantaneous value of the simulated signal and the measured data as the evaluation standard, the similarity between the method in this paper and the actual flight data is greatly improved, which verifies the validity of the model.
- torpedo /
- subsea reverberation /
- motion platform /
- Bellhop model /
- element scattering model

HTML全文

图 1 海底混响网络模型框架图

Figure 1. Frame diagram of the subsea reverberation network model

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图 2 海底混响模型几何结构图

Figure 2. Geometric diagram of the subsea reverberation model

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图 3 不同方法得到的传播损失

Figure 3. Transmission loss obtained by different methods

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图 4 混响仿真流程图

Figure 4. Flow chart of reverberation simulation

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图 5 仿真信号时域波形

Figure 5. Time domain waveform of the simulated signal

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图 6 6×6平面阵的3D波束方向图

Figure 6. 3D beam pattern of 6×6 planar array

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图 7 CW仿真信号时频分布图

Figure 7. Time-frequency distribution diagram of CW simulation signal

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图 8 LFM仿真信号时频分布图

Figure 8. Time-frequency distribution diagram of LFM simulation signal

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图 9 CW仿真信号与实测信号瞬时值的概率密度

Figure 9. Probability density of instantaneous values of CW simulated and measured signals

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图 10 LFM仿真信号与实测信号瞬时值的概率密度

Figure 10. Probability density of instantaneous values of LFM simulated and measured signals

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表 1 不同方法仿真信号与实测信号PDF点积比

Table 1. Dot product ratio of simulation signals and measured signals for different methods

方法仿真与实测信号PDF点积比
CW信号 LFM信号

改进前 0.23 0.27
改进后 0.84 0.93

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